Aluminium alloy



Patented May 3, 1938 UNITED. STATES 7 2,110,275 ALUMINIUM ALLOYYonosuk'e Matuenaga, Naka-ku, Yokohama,

Japana No Drawing. Application November 12, 1936,

Serial No. 110,554.

1 Claim.

This application is a continuation-in-part of applicant's copendingapplication Serial No. 78,722 filed May 8, 1936.

' This invention relates to an aluminium alloy 5 comprising main andauxiliary elements, the main elements consisting of 2 to 5% magnesium, 6to 14% zinc, 0.2 to 2.5% copper, 0.1 to 2.0% nickel, 0.01 to 1.5% iron,0.1 to 1.0% silicon and the rest substantially aluminium, while theauxiliary elements consisting of a metal selected from the group .of0.1m 1.5% manganese, 0.1 "to 0.5% ti- 1 tanium and 0.1 to 1.0% lithium.The object of the invention is to obtain an aluminium alloy which has agreat tensile strength especially when In Japan May 13, 1935 Example 3 C1.15 Ni--- 0.7

Fe 0.2 Si..- 0.8 1.1-- 0.3 Al Rest Tensile strength kg./cm. 57Elongation, percent; 11

The alloy may also contain two or more of the auxiliary metals as to beseen in the follow- 15 subjected under heat treatment. examples, 15

The new alloy may also contain a small quantity Example 4 of-cobalt,molybdenum, vanadium, tungsten or beryllium without appreciable changeof the na- 1% 11% 111% IV% tures. Mg 2.85 3.15 3.00 3.50 Examples of thealloy showing percentages of Zn 9. .00 9.00 2 the elements employed andalso tensile strength 00.. 0.40 0.65 0.80 0.95 and elongation when thealloys are subjected NL--"----,- 5 0 .85' under-a mode of tempering andannealing are Fe 0.50 1.00 1.25 1.50 given as follows: Si 0.60 0.60 0.600.60 Example 1 Mn 0.80 0.80 0.80 0.80 25 Ti 0.04 0.08 0.10 0.12 M 2,5 AlRest Best Best Rest Zn 9,0 Tensile strength 00.. 1.0 Isa/cm. 63.0 65.569.5 68.5 30101 L0 Elongation, percent. 9.0 6.0 I 3.5 3.0 When thepercentage of iron is decreased, the 31 hardness is increased asfollows: v f, g. v% v1% vn% mm 35 Tensile strength kg./cm.= 00 Mg 3.503.50 3.50 3.50 35 Elongation, per 10 Zn 9.00 9.00 9.00 I 9.00 Cu. 0.090.09 0.09 0.09 Exam le 2 N1 0.85 0.85 0.85 1.20 40 p Fe 0.08 0.00 0.000.08 40 Si 0.60 0.30 0.30 0.30 if, 2'3 Mn 0.00 0.00 1.20 0.80 cm Ti 0.120.12 0.12 0.12 m A] Rest Rest Rest Rest Tensile strength kgJcm. 07.970.0 "71.1 71.0.v 45 g: Elongation, percent 3.9 4.8 6.8 6.0 T A1 a vRest About About About About 'Tensile strength kgJcm. as Lockwell--. .0797 I .97 07 b Brinell--. 210 to Elongation, :percent 10 Example 5 Mg-2.85 Zn 9.0 c 0.5 Ni 0.3 F 0.3 Si 0.9 Tl 0.04 Li 0.2 M Rest Tensilestrength kg./cm.= 59 Elongation, per cent 9 Example 6 Mg 2.85 Zn 9.0 C0.5 Ni 0.3 Fe 0.2 Si 0.8 Ti 0.2 Li 0.2 Al Rest Tensile strengthkg./cm.'- 60 Elongation, per cent 8 Example 7 Mg 2.85 2.85 2.85 2.85 Zn9.0 9.0 9.0 9.0 Cu 0.5 0.5 0.5 0.5 Ni 0.3 0.3 0.3 0.3 Fe 0.2 0.2 0.2 0.2St 0.8 0.8 0.8 0.8 Mn 0.8 0.8 0.8 0.8 Ti 0.2 0.2 0.2 0.2 Li 0.1 0.1 0.41.0 Al Rest Rest Rest Rest Tensile strength kg./cm.= 69.0 64.6 63.7 64.94.0

Elongation, per cent. 6.8 11.4 11.2

As seen from the above examples, the new' alloy has a very great tensilestrength which is hardly obtainable in known aluminium alloys.

As to mutual actions of the elements for the new alloy, it is supposedas follows. A part of magnesium may combine with silicon to formmagnesium silicide, and another part of magnesium may be alloyed with apart of zinc and a part of aluminium to form various three elementalalloys ot diflerent percentage. Further copper and nickel may be alloyedwith iron. These chemical compounds and alloys may crystal out in themain element, viz., aluminium and may be uniformly distributed therein.Further, when manganese is employed, this manganese and titanium notonly act as reducing agents, but also hinders the growth of particles ofzinc-manganese-aluminium alloys and also of copper-nickeliron alloy sothat the distribution of the alloy may be promoted.

Also, as shown in Example 4, the smaller percentage of iron gives agreater hardness. This fact is supposed to be that alloys of iron andother elements may be of smaller hardness as compared with the alloyscontaining no iron so that an alloy having a smaller percentage of lesshardness may have a greater hardness. Also, it is supposed that iron hasa tendency of decreasing the tensile strength and elongation while thisdrawback is eliminated by using silicon or silicon and manganese in agreater percentage.

What I claim is:--

An aluminium alloy containing 2 to magnesium, 6 to 14% zinc, 0.2 to 2.5%copper, 0.1 to 2.0% nickel, 0.01 to 0.5% iron, 0.1 to'1.0% silicon, 0.1to 1.5% manganese, and the rest aluminium.

YONOSUKE MA'I'UENAGA.

